Remove dead fields and always-False plumbing across SB / FB / LogitsMetadata (#26551)

python/sglang/srt/batch_overlap/two_batch_overlap.py

@@ -754,9 +754,7 @@ class TboForwardBatchPreparer:
                 global_num_tokens_for_logprob_cpu=None,
                 sampling_info=None,
                 # For logits and logprobs post processing, thus we do not care
-                temp_scaled_logprobs=False,
                 temperature=None,
-                top_p_normalized_logprobs=False,
                 top_p=None,
                 mm_inputs=None,
                 top_logprobs_nums=None,

python/sglang/srt/layers/logits_processor.py

@@ -43,7 +43,6 @@ from sglang.srt.layers.dp_attention import (
 )
 from sglang.srt.layers.utils.logprob import (
     InputLogprobsResult,
-    compute_temp_top_p_normalized_logprobs,
     get_token_ids_logprobs_chunk,
     get_token_ids_logprobs_prefill,
     get_top_logprobs_chunk,
@@ -132,9 +131,7 @@ class LogitsMetadata:
     token_ids_logprobs: Optional[List[List[int]]] = None
 
     # logits and logprobs post processing
-    temp_scaled_logprobs: bool = False
     temperature: torch.Tensor = None
-    top_p_normalized_logprobs: bool = False
     top_p: torch.Tensor = None
 
     # DP attention metadata. Not needed when DP attention is not used.
@@ -362,9 +359,6 @@ class LogitsProcessor(nn.Module):
             )
 
         # Start to process input logprobs
-        # Normalize the logprob w/o temperature, top-p
-        self._expand_metadata_for_logprobs(logits_metadata, pruned_states.device)
-
         # Determine whether to use chunked or non-chunked logits processing.
         # Skip chunking if:
         # 1. Chunking is disabled
@@ -617,29 +611,8 @@ class LogitsProcessor(nn.Module):
 
         return hidden_states_to_store
 
-    def _expand_metadata_for_logprobs(
-        self, logits_metadata: LogitsMetadata, device: torch.device
-    ):
-        pruned_lens = torch.tensor(
-            logits_metadata.extend_logprob_pruned_lens_cpu,
-            dtype=torch.int64,
-            pin_memory=is_pin_memory_available(),
-        ).to(device, non_blocking=True)
-        if logits_metadata.temp_scaled_logprobs:
-            logits_metadata.temperature = torch.repeat_interleave(
-                logits_metadata.temperature.view(-1),
-                pruned_lens,
-            ).view(-1, 1)
-        if logits_metadata.top_p_normalized_logprobs:
-            logits_metadata.top_p = torch.repeat_interleave(
-                logits_metadata.top_p,
-                pruned_lens,
-            )
-
     def process_input_logprobs(self, input_logits, logits_metadata: LogitsMetadata):
-        input_logprobs = compute_temp_top_p_normalized_logprobs(
-            input_logits, logits_metadata
-        )
+        input_logprobs = torch.nn.functional.log_softmax(input_logits, dim=-1)
 
         # Get the logprob of top-k tokens
         if logits_metadata.extend_return_top_logprob:
@@ -762,26 +735,8 @@ class LogitsProcessor(nn.Module):
 
             # Compute the logprobs of the chunk
             chunk_input_logprobs = chunk_logits[chunk_indices]
-            # Only index per-token arrays when the corresponding feature is active.
-            # Otherwise these tensors can be per-sequence (or scalars), which can
-            # cause out-of-bounds indexing on GPU.
-            chunk_temperature = (
-                logits_metadata.temperature[global_indices]
-                if logits_metadata.temp_scaled_logprobs
-                and logits_metadata.temperature is not None
-                else None
-            )
-            chunk_top_p = (
-                logits_metadata.top_p[global_indices]
-                if logits_metadata.top_p_normalized_logprobs
-                and logits_metadata.top_p is not None
-                else None
-            )
-            chunk_input_logprobs = compute_temp_top_p_normalized_logprobs(
-                chunk_input_logprobs,
-                logits_metadata,
-                chunk_top_p,
-                chunk_temperature,
+            chunk_input_logprobs = torch.nn.functional.log_softmax(
+                chunk_input_logprobs, dim=-1
             )
 
             # For each chunk, we need to get the slice of the token_to_seq_idx

python/sglang/srt/layers/utils/logprob.py

@@ -29,40 +29,6 @@ class InputLogprobsResult:
     input_token_ids_logprobs_idx: Optional[List] = None
 
 
-def compute_temp_top_p_normalized_logprobs(
-    last_logits: torch.Tensor,
-    logits_metadata: LogitsMetadata,
-    top_p: Optional[torch.Tensor] = None,
-    temperature: Optional[torch.Tensor] = None,
-) -> torch.Tensor:
-    """
-    compute logprobs for the output token from the given logits.
-
-    Returns:
-        torch.Tensor: logprobs from logits
-    """
-    if top_p is None:
-        top_p = logits_metadata.top_p
-    if temperature is None:
-        temperature = logits_metadata.temperature
-
-    # Scale logits if temperature scaling is enabled
-    if logits_metadata.temp_scaled_logprobs:
-        last_logits = last_logits / temperature
-
-    # Normalize logprobs if top_p normalization is enabled
-    # NOTE: only normalize logprobs when top_p is set and not equal to 1.0
-    if logits_metadata.top_p_normalized_logprobs and (top_p != 1.0).any():
-        from sglang.srt.layers.sampler import top_p_normalize_probs_torch
-
-        probs = torch.softmax(last_logits, dim=-1)
-        del last_logits
-        probs = top_p_normalize_probs_torch(probs, top_p)
-        return torch.log(probs)
-    else:
-        return torch.nn.functional.log_softmax(last_logits, dim=-1)
-
-
 def get_top_logprobs_raw(
     logprobs: torch.Tensor,
     top_logprobs_nums: List[int],

python/sglang/srt/managers/schedule_batch.py

@@ -1509,10 +1509,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
     split_forward_count: int = 1
     split_forward_batch: ForwardBatch = None
 
-    # For logits and logprob post processing (ForwardBatch keeps its own copies)
-    temp_scaled_logprobs: bool = False
-    top_p_normalized_logprobs: bool = False
-
     # CPU mirror of req_pool_indices; schedule-path only (used in overlap_utils,
     # not read by ForwardBatch), stale in spec draft window
     req_pool_indices_cpu: torch.Tensor = None  # shape: [b], int64
@@ -1520,9 +1516,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
     # Forward-pass metrics
     fpm_start_time: float = 0.0
 
-    # Stream
-    has_stream: bool = False
-
     # Whether to return captured experts
     return_routed_experts: bool = False
     return_indexer_topk: bool = False
@@ -1673,7 +1666,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
             model_config=model_config,
             enable_overlap=enable_overlap,
             return_logprob=return_logprob,
-            has_stream=any(req.stream for req in reqs),
             has_grammar=any(req.grammar for req in reqs),
             device=req_to_token_pool.device,
             spec_algorithm=spec_algorithm,
@@ -2585,7 +2577,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
             self.top_logprobs_nums = None
             self.token_ids_logprobs = None
 
-        self.has_stream = any(req.stream for req in self.reqs)
         self.has_grammar = any(req.grammar for req in self.reqs)
 
         self.sampling_info.filter_batch(keep_indices, keep_indices_device)
@@ -2641,7 +2632,6 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
             self.multimodal_inputs.extend(other.multimodal_inputs)
 
         self.return_logprob |= other.return_logprob
-        self.has_stream |= other.has_stream
         self.has_grammar |= other.has_grammar
         self.return_hidden_states |= other.return_hidden_states
         self.is_prefill_only = self.is_prefill_only and other.is_prefill_only

python/sglang/srt/model_executor/forward_batch_info.py

@@ -406,9 +406,7 @@ class ForwardBatch(ForwardBatchDeepSeekMHAMixin):
     # === Runtime-filled (set during the forward pass / cuda graph / managers; not at construction) ===
     # For logits and logprobs post processing
     next_token_logits_buffer: torch.Tensor = None
-    temp_scaled_logprobs: bool = False
     temperature: torch.Tensor = None
-    top_p_normalized_logprobs: bool = False
     top_p: torch.Tensor = None
 
     # For split prefill

python/sglang/srt/model_executor/piecewise_cuda_graph_runner.py

@@ -771,9 +771,7 @@ class PiecewiseCudaGraphRunner:
             lora_ids=forward_batch.lora_ids,
             sampling_info=forward_batch.sampling_info,
             mm_inputs=forward_batch.mm_inputs,
-            temp_scaled_logprobs=forward_batch.temp_scaled_logprobs,
             temperature=forward_batch.temperature,
-            top_p_normalized_logprobs=forward_batch.top_p_normalized_logprobs,
             top_p=forward_batch.top_p,
             dimensions=forward_batch.dimensions,
             return_pooled_hidden_states=(